1. Sufficiently significant to affect the whole world
   - earthshaking, world-shaking, world-shattering

See also: important, significant

• keel arch
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• keelage
• keelboat
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• keelhaul
• keelson
• keen
• keen-eyed
• keen-sighted
• keenly
• keenness
• keep
• keep abreast
• keep an eye on
• keep apart
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• keep guard